ORACLE查詢每個(gè)表占用空間大小的方法

SELECT 'select sum(bytes) FROM dba_segments WHERE owner ='|| '"TESTBAR"'||' AND segment_type ='|| '"TABLE"'||' AND segment_name = "'|| table_name||'" ;' from user_tables;

錯(cuò)誤的，對于oracle而言，雙引號

要用單引號，可用

可以用ASCII碼處理，其它特殊字符如&也一樣，如
insert into t values('i'||chr(39)||'m'); -- chr(39)代表字符'
或者用兩個(gè)單引號表示一個(gè)
or insert into t values('I''m'); -- 兩個(gè)''可以表示一個(gè)'

SELECT 'select segment_name,sum(bytes) FROM dba_segments WHERE owner ='|| chr(39)||'TESTBAR'||chr(39)||' AND segment_type ='||chr(39)||'TABLE'||chr(39)||' AND segment_name = '|| chr(39)||table_name||chr(39)||';' from user_tables;

注意，對于分區(qū)表要采用"TABLE PARTITION"方式

SQL> set linesize 300
SQL> set head off

SQL> spool 1.sql

exec statement

SQL>spool off

處理空行問題：

采用excel的自動(dòng)篩選進(jìn)行空行過濾!以及計(jì)算空間總和。

實(shí)用考慮：

0 產(chǎn)生行一例

select 'SELECT sum(bytes)/1024/1024 Mbytes FROM user_segments WHERE segment_type = '||chr(39)||'TABLE'||chr(39)||' AND segment_name = '||chr(39)||segment_name||chr(39)||';' from user_segments where segment_type='TABLE';

0、查看用戶表、索引、分區(qū)表占用空間

select segment_name, sum(bytes)/1024/1024 Mbytese from user_segments group by segment_name;

1、表占用空間

select segment_name, sum(bytes)/1024/1024 Mbytese from user_segments where segment_type='TABLE' group by segment_name;

2、索引占用空間select segment_name ,sum(bytes)/1024/1024 from user_segments where segment_type ='INDEX' group by segment_name;

3、分區(qū)表TABLE PARTITION占用空間

select segment_name,sum(bytes)/1024/1024 Mbytes from user_segments where segment_type='TABLE PARTITION' group by segment_name;